Improvement in steam-engine cut-offs



@that (time.

CHARLES CARR, OF BOSTON, MASSACHUSETTS.

Letters .Patent No. 89,289, dated A11/rtl 27, 1869; aatedatetl April 17,1869.

IMPROVEMENT IN STEAM-ENGINE CUT-LFPS.

' -The Schedule referred to in these Lettera Patent and making part ofthe lame.

-the county of Suffolk, and State of Massachusetts,

have invented a new and useful Improvement in Self- Adjusting Out-OffsforfStea-m or Calorie-Engines; and

I do hereby declare the following is` a full, clear, and

exact description of theconstruction and operation of the same,reference being had to the drawings, making a part ofthisvspecification, of which- Y Figure 1 is a transverse section of thecylinder and steam-chest on line C D, fig. 3.

Figure 2 is an elevation of the cylinder, showing the gearing andtoggle-joint.

Figure 3 is a horizontal section on line'A B, iig. 1. Figure 4 is anelevation of the spindle, hollow shaft, cam, key, and gudgeon p, onwhich the ca is hung.

Figure 5 is an elevation f the cam an key, also section of the hollowshaft and spindle, the dotted lines a a showing the cams in differentpositions, as varied by the governor. Figure 6 is a sectional elevationof the disks and gearing, showing the governor-rod b, in connection withthe ,toggle-joint c c, and reciprocating rod n.

Y Figure' is a sectional elevation, showing the direction of movement ofthel cam, and its position at the time of opening the valve.

Like gures indicate the same or corresponding parts in all the figuresor drawings.

lr is a rod, attached to the governor, the lower end of this beingsecured at the centre of the toggle-joint or arms c c and these armsbeing held at o, cause the rod n to reciprocate, thereby forcing theinclined key t' under, or withdrawing it from the cams h, caus.

ing the cams to rise'or fall, which, in so doing, raise the steam-valvesmore or less, without materially changing their lead, the lifting pointalways being opposite the gndgeons p, thus holding open the valves alonger or shorter period, as the resistance to the engine is increasedor diminished.

The particular features of this cam are as follows:

Its driving-shaft passes through it, or it may partially'encircle theshaft, leaving sufficient space -bektween it and the shaft to allow itto project or recede by the reciprocation of the key fi.

It is also driven by this shaft, aud/is hung to said shaft at a pointremote from its centre, or eccentric to its axis.

To use this cam singly, a hollow shaft is not required, as the key 'imay be vpassed between the cam h and its driving-shaft.

rlhe operation ofthe cams obviates-the necessity of a series of calns,as they are variable, raising the valves more or less, or for a longeror shorter period, at the same time not liberating the valves, butallows them to follow their surface in closing.

This invention may be used with marine as well as stationary engines,whether vertical or horizontal.

In working valves in the position shown, the arms ff, interposed betweenthe valves r and stems g, and hanging at the centre, are to prevent thefriction upon the valves in their vertical motion, which would occurwere they to travel on the end of stem g, and also to cause them toproperly seat themselves in closing.

I claim nothing new in relation to the valves or l their arrangement,they not being essen tial to the operation of the cams, as they may begiven a horizontal or perpendicular motion.

Having thus described my invention, l

What I claim therein, and desire to secure by Letters Patent, is f 1.The cam h, substantially as shown and described, and for the purposesset forth.

2. Also, thel combination of the variable cam h, pivot, gudgeon p,hollow shaft m, rod n, stem g, arms j, and valves lr, as herein setforth.

3. Also, the inclined key t, in combination with the adjustable cams h.,as herein described.

4. Also, in combination with the cam h, the inclined key i, the hollowshaft m, the rod n, and toggle-joint c e, for the ypurpose of actuatingthe cams h from the governor-rod b, as described.

5. Also, the arrangement of the arms f f, sliding valve av, and stem g,as described. l

CHARLES GARR.

Witnesses:

lZ. E. Comun,

THOMAS GAusr.

